I already had my NFC on my wireless charging stand associated with Night Stand Clock. I opened accessories, tapped and held on the Charging Stand, and Deleted it. Re-pairing it with NFC launched this app with no "accept" dialog required. Nice!
Update: It also shows your next calendar entry. The app it launches is called Weather and Calendar, but it does not show up in the standard App List. By default, it uses "current location," but can be changed. And it won't launch for me unless it's receiving a charge.
Also, the second time I launched it, it required me to Accept before launching the dock program.
It also shows battery charge status.
[update2]: This feature is nice, especially with the calendar, but I still prefer Night Stand Clock (link:
http://www.windowsphone.com/en-us/store/app/night-stand-clock/19c2c6c3-6eeb-df11-9264-00237de2db9e). And unrelated, but my 920 just rebooted itself.